This “Doctor Who” gets much of its buoyant energy from Ncuti Gatwa’s performance in the title role, here joined by Millie Gibson as Ruby Sunday, a foundling who boards the TARDIS as the ...

Recent and archival articles, essays, photographs, videos, infographics, writing prompts, lesson plans and more. By The Learning Network We asked students, “What are you thinking and feeling ...

Ruby is an incredibly durable gemstone if there are no treatment-related durability concerns. - Courtesy Jan Goodman Co. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale.

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